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Finding the Fourth Proportional to 613.71, 920.97 and 611.28

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Solution

The fourth proportional to 613.71, 920.97 and 611.28 is: 917.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.71 : 920.97 = 611.28 : x
  2. Step 2: Convert to fraction form
    613.71/920.97 = 611.28/x
  3. Step 3: Cross multiply
    613.71x = 920.97 × 611.28
  4. Step 4: Simplify right side
    613.71x = 562,970.54
  5. Step 5: Solve for x
    x = 562,970.54/613.71
  6. Step 6: Final answer
    x = 917.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.